18. After the situation has been examined, the intervention of an inspector may be required by(1) the worker, if he maintains his refusal to perform the work;
(2) the safety representative or the person replacing him if he believes that the performance of the work exposes the worker to danger to his health, safety or physical or mental well-being or exposes another person to similar danger; or
(3) the employer or his agent, if he believes that the performance of the work does not expose the worker to danger to his health, safety or physical or mental well-being or does not expose another person to such danger, or that the corrective measures taken have dissipated the danger.